package com.lcy.reggie.filter;

/**
 * ======刘春春大帅逼======
 * ******java学习之旅******
 */


import com.alibaba.fastjson.JSON;
import com.lcy.reggie.common.Result;
import com.lcy.reggie.utils.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 *  检查用户是否已经登陆
 */

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpServletRequest request = (HttpServletRequest) servletRequest;

        //1.获取本次请求的URI
        String uri = request.getRequestURI();
        //2.定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg", //移动端发送短信
                "/user/login" //移动端登录
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, uri);
        //3.如果不需要处理，则直接放行
        if(check){
            filterChain.doFilter(request,response);
            return;
        }

        //4.1判断登录状态，如果已经登陆，则直接放行
        if(request.getSession().getAttribute("employee") != null){

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId); //拿到id，存入ThreadLocal

            filterChain.doFilter(request,response);
            return;
        }

        //4.2判断移动端用户登录状态，如果已经登陆，则直接放行
        if(request.getSession().getAttribute("user") != null){

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId); //拿到id，存入ThreadLocal

            filterChain.doFilter(request,response);
            return;
        }

        //5.如果未登录则返回未登录结果，通过输出流方式像客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(Result.error("NOTLOGIN")));
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     */
    public boolean check(String[] urls,String uri){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, uri);
            if(match){
                return true;
            }
        }
        return false;
    }
}
